Method to measure the angle of incidence for radiation and a detector to carry out the method
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United States of America Patent
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Jun 11, 1991
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N/A
app pub date -
Jul 20, 1989
filing date -
Nov 27, 1987
priority date (Note) -
Expired
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Abstract
The present invention relates to a method to measure the angle of incidence for radiation and a detector to carry out the method. The background for the invention is that in certain electromagnetic radiation, for example laser light of different wavelengths from UV to IR, there occurs an irregularity, speckledness, that is among other things caused by turbulence in the atmosphere. This phenomenon gives rise to problems during the registration of a single or a few short pulses of radiation. Difficulties to reliably determine the angle to the source of radiation with high resolution can arise. This problem is solved by the invention by mounting two detector elements (1,2) so close to each other that both detector elements receive essentially the same irradiance and in such a direction that the normals of respective detector element form a known angle (.beta.) with each other. One then calculates the angle of incidence (.alpha.) by means of the signals (S.sub.1,S.sub.2) from the detector elements (1,2), that depend on the shape of the sensitivity beams, and said angle (.beta.) between the detector elements.
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